calyelag-e



(No Model.)

3 Sheets-Sheet 1.

v A'. GALVELAGB & J. M. DODGE.

GAS FURNACE Patented Oct.

WITNESSES.

wdfm QMQM MZ (No Model.) 3 Sheets-Sheet 2. A. H. OALVELA'GB 81; J. M.DODGE.

GAS FURNACE.

No. 306,717. Patented Oct. 21, 1884.

WITNESSES.

(No Model.) 3 SheetsSheet 3. A. H. C'ALVELAGE & J. M. DODGE.

GAS FURNACE. No. 306.717. Patented Oct. 21, 1884.

N. PETERS. Pnuto-Lilhn n lw. Washingicn. D. c.

Nrreo STATES error...

AUGUST I-I. CALVELAGE, OF HAUGHVILLE, AND JAMES M. DODGE, OFINDIANAPOLIS, INDIANA.

GAS-FURNACE.

SPECIFICATIQN forming part of Letters Patent. No. 306,717, dated October21, 1884.

Application filed October '30, 1883. (No model.)

To all whom it may concern:

Be it known that we, AUGUST H. CALVE- mon, of I-Iaughville, and James M.DODGE, ofIndianapoli s, county of Marion, and State of Indiana, haveinvented certain new and useful Improvements in Gas-Furnaces, of whichthe following is a specification.

The object of our said invention is to produce a cokingand heatingfurnace for various purposes, in which a great degree of economy shallbecoupled with the best results. This object is accomplished by theconstruct-ion and arrangement of the cokingoven, the firespace, and thegas and air passages, so that the gas from the coking-oven andatmospheric air from an air-passage or air-passages may be combined ator near the point where they enter the combustionchamber, as will bepresently described.

Our furnaceis especially adapted to be used with an annealing-furnace inthe production of malleable-iron castings, and is illustrated inconnection with such a furnace.

eferring to the accompanying drawings, which are made a part hereof, andon which similar letters of reference indicate similar parts, Figure 1is a side elevation of a furnace embodying our said invention; Fig. 2, avertical sectional view thereof looking upwardly from the dotted line .2in Fig. 3; Fig. 3, a horizontal sectional view looking downwardly fromthe dotted line 3 y in Fig. 2; Fig. 4, a vertical sectional view lookingtoward the right from the dotted line :0 00,- Fig. 5, a viewcorresponding to Fig. 2 of another and some what simpler construction,but which em-l bodies substantially the same general matter; and Fi 6, afront elevation of the form shown by Fig.

I11 said drawings the portions marked A represent the ash-pit; B, thegrate-bars; O, the combustiouchamber; D, the coke-oven; E, a combinedgas and fuel passage; F, a separate gas-passage; G II, openings throughwhichair enters the combustion-chamber; and I, an annealing-furnaceshown in connection with our improved furnace and as receiving its heattherefrom.

In using our invention the fgel is first placed in the coking-oven D,where it is allowed to remain until coked to a sufficient extent to freethe gases or volatile matter contained therein. The gas generated duringthe process of coking passes into the combustionchamber through thecombined gas and fuel passage E, and in the construction shown by- Figs.1, 2, 3, and 4 through the gas-passage F; being thus, in thisconstruction, distributed by means of the several passages equally toboth sides of said chamber, thus producing a more perfect combustion.After the fuel is coked to the desired extent it is pushed along thebottom of the coke-oyen, over onto the grate-bars, and is thereconsumed. By reason of the flow of gas into the combustion-chamher, agreater supply of atmospheric air is needed to insure a perfectcombustion of the fuel than would otherwise be necessary, and we havetherefore provided an opening or airpassage, G, to furnish such supply.In the construction shown in Figs. 1, 2, 3, and awe provide a secondpassage, H, and numerous small inlets, g h, from said two passages, tomore equally distribute such supply. These openings GII are adapted tobe closed or partlyclosed by the dampers g h. The gas andair passages,as will be seen, reach the com bustion-chamber at or near the samepoint. and thus a substantially perfect combustion and consequent greateconomy in the use of fuel is secured, as will be readily understood,

the supply of air being easily regulated by means of the dampers, andthe supply of gas by the quantity and method of handling the .fuel. Theair is preferably heated before being admitted, and in the form offurnace shown by Figs. 5 and'o this is accomplished by means of the heatfrom the coking-oven strik-.

ing the under wall of the air-passage, and the radiation of heat throughthe overhead arch. In the other figures we have. shown no means ofaccomplishing this result. The products of combustion enter theannealing-furnace I through the fire-ports G, and pass through the same,down the fines 4. under the bottom h, and out through appropriate finesto a smoke-stack. (Not shown.)

Having thus fully described our said invention, What we claim as new,and desire to secure by Letters Patent, is-

1. l'nal'nrnaega eokingovemacombustion 23. The combination, with theC(JlllbllSLlUlh chamber, passages leading from the cokingehamber, of anarch over the same, a cokingehamber into both sides of thecombustionoven attheside oi'the chamber,communicating ehamber, andopenings for the admission of therewith directly at one side and overthe 20 5 air to said passages at their entrance to the arch to the otherside, and passages from the combustion chamber, substantially as deendof the arch to convey heat to a heatingseribed, and for the purposesspecified. chamber, all relatively arranged substantially 2. In acombined coking and heating fnras shown and described. naee, thecoking-oven, eombustioil-chamber, a In witness whereof W0haveherenntoset our 25 1o passage leading from the oven to theehamber,hands and seals, at Indianapolis, Indiana, this and one or moreair-passages controlled by i 27th day of October, A. I). 1813.

dampers arranged as set forth, whereby the AUGUST ll. (JAlNlilnidIl. [L.a] from the oven and the air asit enters JAMES M. DODGE. [11. s] throughsaid airmssages are combined at or In presence of 15 near the pointwhere they enter the eombnsl5. \V. fllluntoni),

tion-ehzmiber, substantially as set forth. Urns. I Tnnnnnn.

